78986761 has 16 divisors (see below), whose sum is σ = 94961664. Its totient is φ = 64232784.

The previous prime is 78986759. The next prime is 78986773. The reversal of 78986761 is 16768987.

It is not a de Polignac number, because 78986761 - 2¹ = 78986759 is a prime.

It is a super-2 number, since 2×78986761² = 12477816826542242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78986699 and 78986708.

It is not an unprimeable number, because it can be changed into a prime (78986261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18516 + ... + 22378.

It is an arithmetic number, because the mean of its divisors is an integer number (5935104).

Almost surely, 2^78986761 is an apocalyptic number.

It is an amenable number.

78986761 is a deficient number, since it is larger than the sum of its proper divisors (15974903).

78986761 is a wasteful number, since it uses less digits than its factorization.

78986761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020.

The product of its digits is 1016064, while the sum is 52.

The square root of 78986761 is about 8887.4496341751. The cubic root of 78986761 is about 429.0600724031.

The spelling of 78986761 in words is "seventy-eight million, nine hundred eighty-six thousand, seven hundred sixty-one".